Printing plate base



Aug. l0, 1937. H. w. HACKER PRINTING PLATE BASE Original Filed May 6, 1935 Patented Aug. 10, 1937 UNETED STATES FTENT OFFICE Y Application May 6, 1935, Serial No. 20,069

Renewed June 1, 1937 Claims.

My invention relates to lumber from which printing plate bases are toy be cut and generally speaking has for its purpose an elementary construction of lumber whereby printing plate bases 5 cut therefrom will possess a high degree of stability as to size and form under atmospheric and moisture conditions incident to their use and wherein elements enhancing such stability also serve as reinforcements against side lock-up pressure. Furthermore, my present invention is designed to facilitate the planing for heighth of printing plate bases cut from lumber characterized by wood blocks secured between metal plates and to simplify and cheapen the manufacture of such lumber as is disclosed in Figure 2 of my copending application Serial Number 759,- 571; led December 28, 1934, and now Patent No. 2,033,705.

In the drawing chosen to illustrate my invention the scope whereof is set forth in the appended claims Figure 1 is a fragmentary perspective View of a printing plate base cut from lumber constructed in accordance with my invention;

Figure 2, a section on the line 2-2 of Figure 1; l

i Figure 3, a View similar to Figure 1 showing an alternative form of my invention;

Figure 4, a section on the line 4 4 of Figure 3; and

Figure 5, a fragmental perspective showing of a modification showing the veneer facings of the lumber kerfed in cross directions.

In Figures 1 and 2 my improved lumber is shown as comprising a plurality of wood blocks I0 positioned between thin metal plates Il and l2. The blocks l0 are arranged with their adjacent faces slightly spaced apart to eliminate detrimental and undesirable cumulative effect of side swelling of the blocks which otherwise might arise were the blocks arranged with their side faces in contact. The metal plates ll and I2 are shown as having holes punched therein to provide formations i3 projecting from their inner faces and which formations are engaged in the adjacent faces of the blocks l0, thus forming an intert between the blocks and plates which assists materially in preventing any relative lateral di.,- placement of the blocks and plates, while the latter also serve as reinforcements against side lockup pressure in bases cut from the finished lumber. It will of course be understood that the blocks IIJ and plates Il and I2 are suitably cemented together. In order to provide for easy planing of bases cut from my lumber I cement to (Cl. lOl-382) the outer face of each of the plates Il and l2 strips of wood veneer i4 having their adjacent edges spaced apart to avoid cumulative effects of swelling. Preferably, but not necessarily, I arrange the strips lli at an angle to both axes of the 5 lumber which eliminates the necessity of carei fully positioning plates upon a cut base in order to miss the space between the Veneer strips at the points where the plate is nailed to the base.

The construction shown in Figures 3 and 4 dif- 10 fers from that shown in Figures 1 and 2 in that each succeeding hole is punched in the metal plates in a direction opposite to the preceding one to provide projections l5 and I6 on respective faces of each plate, the projections l5 being en- 15 gaged in the blocks l0 and the projections I6 being engaged in the veneer strips I4, whereby the plates have interconnection with both the blocks l0 and the veneer strips M.

In order to facilitate the application of the 20 Veneer strips iii at an angle to both axes of the lumber I apply continuous sheets of wood veneer to the outer face of each metal plate I2 and Il and then kerf each sheet of veneer on lines parallel to each other and at an angle to both axes 25 of the lumber. This is a desirable manner of positioning the strips I4 but my invention is not j limited thereto as the fundamental purpose of the kerfing is to separate the sections of veneer and any manner of kerfing will accomplish the 30 end.

In Figure 5 I show the veneer facings of the lumber kerfed in cross directions whereby the veneer sheets are cut up into spaced apart small units l'l. This construction further enhances the 35 anti-warping characteristics of the veneer facings.

I claim:

l. Lumber from which printing plate bases are to be cut and the contacting surfaces of whose elements are cemented together, comprising metallic sheets, a plurality of wood blocks between the sheets, and a plurality of wood veneer sections secured to and overlying the outer face of each metallic sheet, the adjacent edges of said veneer sections being disposed in spaced relation.

2. Lumber from which printing plate bases are to be cut and the contacting surfaces of whose elements are cemented together, comprising metallic sheets having formations on their opposed faces, a plurality of wood blocks between the sheets into which said formations are engaged, and a plurality of wood veneer sections secured to and overlying the outer face of each metallic 55 sheet. the adjacent edges of said veneer sections being disposed in spaced relation.

3. Lumber from which printing plate bases are to be out and the contacting surfaces of whose elements are cemented together, comprising metallic sheets having openings punched therein to provide formations on their opposed faces, a plurality of Wood blocks between the rsheets into which said formations are engaged, and a plurality of wood veneer sections secured to and overlying the outer face of each metallic sheet, the adjacent edges o-f said veneer sections being disposed in spaced relation.

4. Lumber from which printing plate bases are to be out and the contacting surfaces of whose elements are cemented together, comprising metallic sheets each having formations projecting from both faces, a plurality of Wood blocks between the sheets into which the formations on opposed faces of the sheets are engaged, and a plurality of Wood veneer sections secured to and overlying the outer face of each metallic sheet and into which formations projecting from the outer face of the related sheet are engaged, the adjacent edges of said veneer sections being disposed in spaced relation.

5. Lumber from which printing plate bases are to be cut and the contacting surfaces of whose elements are cemented together, comprising metallic sheets each having openings punched therein to provide formations projecting from each face thereof, a plurality of Wood blocks between the sheets into Which the formations on opposed faces of the sheets are engaged, and a plurality of Wood veneer sections secured to and overlying the outer face of each metallic sheet and into which formations projecting from the outer face of the related sheet are engaged, the adjacent edges of Veneer sections being disposed in spaced relation.

HORACE W. HACKER. 

